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crwdns2934241:0crwdne2934241:0 bobforsberg92630

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My 1990 GMC had a similar problem. I found oxidation on the rear sockets as well as a loss of "holding tension" of the turn signal bulb socket. I cleaned all the socket contacts with Tarn-X and carefully bent the weak socket contacts closer together,  gripping the bulb better.

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open